Massachusetts - Criteria: A (event)
| Cobb's Tavern |
| Codding Farm, The |
| Coddington School |
| Codman Square District |
| Cogan, Bernard, House |
| Cogan, James, House |
| Cogswell's Grant |
| Cohannet Mill No. 3 |
| Cohasset Central Cemetery |
| Cohasset Common Historic District |
| Colburn, Gilbert, House |
| Colburn School |
| Colburn School-High Street Historic District |
| Colby Hall |
| Colby, Samuel, House |
| Cole, Benjamin, House |
| Cole, E. Merritt, House |
| Coleman Bridge |
| Cole's Hill |
| Collins Building |
| Collins Cottages Historic District |
| Colonial Beacon Gas Station |
| Colonial Block |
| Colony Historic District |
| Colrain Center Historic District |
| Columbia Road-Bellevue Street Historic District |
| Columbia Road-Devon Street Historic District |
| Columbia Road-Strathcona Road Historic District |
| Comfort Station |
| Comins-Wall House |
| Commanding Officer's Quarters, Watertown Arsenal |
| Common Burying Ground at Sandy Bank |
| Common Historic District |
| Commonwealth Avenue Historic District |
| Commonwealth Avenue Historic District |
| Commonwealth Shoe and Leather Co. |
| Community House |
| Community Memorial Hospital |
| Compton Building |
| Concord Armory |
| Concord Monument Square-Lexington Road Historic District |
| Concord Square Historic District |
| Congregation Adath Jeshurun |
| Congregation Agudath Shalom |
| Congregational Church |
| Congregational Church of West Stockbridge |
| Congress Street Fire Station |
| Connell, William M., School |
| Conway Center Historic District |
| Cook, A. E., House |
| Coolidge School |
| Copeland, Samuel, House |
| Copp's Hill Burial Ground |
| Copp's Hill Terrace |
| Coram Shipyard Historic District |
| Corcoran School |
| Corey, Timothy, House No. 1 |
| Corky Row Historic District |
| Cornell Mills |
| Corner Lunch |
| Cottage-Freeman Historic District |
| Cotting, John, House |
| Cotuit Historic District |
| Coughlin School |
| County Street Historic District |
| Court Square Historic District |
| Cove Burying Ground |
| Cove Street Historic District |
| Crabtree, Thomas, Three-Decker |
| Crafts Street City Stable |
| Craigie Arms |
| Craigville Historic District |
| Cranch School |
| Crane and Company Old Stone Mill Rag Room |
| Crane, Frank W., House |
| Cranesville Historic District |
| Crescent Mill |
| Crimmins, Thomas A., House |
| Crocker, Benomi and Barnabas, House |
| Crocker, Ebenezer, Jr., House |
| Crocker Field Historic District |
| Crocker, Lot, House |
| Crompton Loom Works |
| Crossman Bridge |
| Crowell-Bourne Farm |
| Crystal Lake and Pleasant Street Historic District |
| Crystal Street Historic District |
| Cummings, E. B., House |
| Curtis, Noah, House |
| Curtis, Thomas, House |
| Cushman Village Historic District |
| Custom House District |
| Cutler and Porter Block |
| Cutter, Gershom, House |
| Cyclorama Building |
| Cypress-Emerson Historic District |
| Daddy Frye's Hill Cemetery |
| Dalton Grange Hall No. 23 |
| Damon, Joseph, House |
| Damon Mill |
Data from United States Park Service and Wikidata
